Thiamine: The Energy-Conversion Vitamin
Vitamin B1 (thiamine) is a water-soluble B vitamin that plays a central role in converting carbohydrates into usable energy. It is also essential for nerve function, heart health, and brain metabolism. The FDA Daily Value is 1.2mg per day.
Thiamine deficiency (beriberi) was historically a major problem in populations eating polished white rice. Today, deficiency is most common in people with alcohol use disorder, malabsorption conditions, or restrictive diets.
Top Vitamin B1 Foods (Per 100g, USDA Data)
| Food | Thiamine (mg/100g) |
|---|---|
| Pork tenderloin (cooked) | 0.97 |
| Sunflower seeds | 1.48 |
| Flaxseeds | 1.64 |
| Navy beans (cooked) | 0.23 |
| Lentils (cooked) | 0.17 |
| Oats (dry) | 0.76 |
| Fortified breakfast cereal | 0.5–1.5 |
| Brown rice (cooked) | 0.19 |
*Fortified cereal values vary widely — check the nutrition label.
⚡ View full vitamin B1 ranking →Thiamine and Carbohydrate Metabolism
🔋 Converts carbs → ATP energy
Thiamine is a cofactor for pyruvate dehydrogenase — the enzyme that converts glucose into acetyl-CoA for the Krebs cycle. Without enough B1, energy production from carbohydrates becomes inefficient.
🧠 Critical for brain function
The brain relies almost entirely on glucose for energy. Severe thiamine deficiency causes Wernicke encephalopathy — a serious neurological condition involving confusion and vision problems.
🍺 Alcohol depletes thiamine
Alcohol impairs thiamine absorption in the gut and increases excretion. Heavy drinkers have dramatically higher thiamine requirements and should consider supplementation.
Key Takeaways
- ✓Pork is the richest meat source of thiamine — one serving covers 80%+ of daily needs
- ✓Seeds (sunflower, flaxseeds) are excellent plant-based sources of B1
- ✓Whole grains contain significantly more thiamine than refined grains
- ✓Thiamine is destroyed by cooking heat — avoid overcooking B1-rich foods
- ✓High carbohydrate intake increases thiamine requirements — balance your diet
Data Source
USDA FoodData Central — Foundation Foods & SR Legacy (Public Domain)